Fuzzy Text and UI with 4K Monitor

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Fuzzy Text and UI with 4K Monitor

I have the LG 31MU97 Display as the only monitor connected to my new Mac Pro, the LG is one of the few 4K displays Apple supports. Unfortunately all text and UI throughout all applications are very fuzzy and pixelated no matter what my settings are. The most clear setting is the default (4096 x 2160) all of the scaled settings look worse. I've also tried to adjust the limited amount of controls within the display but these did not help.

Another odd thing is that when I attempted to use the "scaled" settings it drastically slowed my computer down. Any suggestions?

Mac Pro, OS X Yosemite (10.10.2), Nothing else connected to computer.

Posted on Mar 30, 2015 9:05 AM

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Answer 1

Mar 30, 2015 9:12 AM in response to Cliff85

what graphics card?

what interface used for the connection?

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Answer 2

Cliff85 Author

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Mar 30, 2015 9:14 AM in response to Grant Bennet-Alder

Thanks, sorry for the missing info. The graphics card is the AMD FirePro D300 2048 MB and the display is connected via DisplayPort.

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Answer 3

lllaass

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Mar 30, 2015 9:19 AM in response to Cliff85

How is it connected?

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Answer 4

Cliff85 Author

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Mar 30, 2015 9:21 AM in response to lllaass

It's connected with a cable running from the Thunderbolt port on the machine to the DisplayPort on the display.

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Answer 5

lllaass

Level 10

210,411 points

Mar 30, 2015 9:30 AM in response to Cliff85

Do you have the monitor set for displayport 1.2? See page 31 of the manual

http://www.lg.com/us/support-product/lg-31MU97-B#

Did you adjust sharpness? Page 28

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Answer 6

Cliff85 Author

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Mar 30, 2015 9:33 AM in response to lllaass

Yes, the display has DisplayPort 2.1 enabled. Thanks for looking in to this.

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Answer 7

Cliff85 Author

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Apr 8, 2015 7:50 AM in response to Cliff85

Hey folks thanks for your help. The problem ended up being a bad display panel, I replaced it and everything sharpened up. I had no idea a display could be fuzzy.

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Answer 8

Aug 23, 2015 7:47 PM in response to Cliff85

How did you come to this conclusion? Did you contact LG? I am having a similar issue with fuzzy text/lines connected to brand new 5K iMac. How do I know If I need a "new Panel"?

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Answer 9

Cliff85 Author

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Aug 24, 2015 8:28 AM in response to Louis_godfree

I returned the monitor in exchange for a new one and that worked, I had assumed it was the computer rather than the display but I got lucky. The replacement display has a gray logo on the front, the prior display's was red, so maybe it was updated??

I have noticed that text will be fuzzy on Mac Pros and and iMacs if you do not set your display to "default for display" in System Preferences. Scaling the resolution makes almost everything look terrible if you are accustomed to quality.

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